PiVPN can't be installed

Troubleshooting
#1

The PiVPN install doesn’t work, I get the following error:
“The PiVPN installer was not successful and/or cancelled prior to its completion.
Would you like DietPi to run the PiVPN installer again?”

When I click on ok to repeat the installation process I get the same fault again (like in a loop).

#2

Do you use dietpi-software to install PiVPN?

#3

I had this recently but it was resolved by trying again after a reboot